RootWindowController::GetFullscreenWindow() should return the active one.

ash/shelf/shelf_layout_manager.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/shelf/shelf_layout_manager.h"
 
 #include <algorithm>
 #include <cmath>
 #include <cstring>
 #include <string>
@@ skipping 507 matching lines @@
 
 bool ShelfLayoutManager::IsHorizontalAlignment() const {
   return alignment_ == SHELF_ALIGNMENT_BOTTOM ||
          alignment_ == SHELF_ALIGNMENT_TOP;
 }
 
 bool ShelfLayoutManager::FullscreenWithMinimalChrome() const {
   RootWindowController* controller = GetRootWindowController(root_window_);
   if (!controller)
     return false;
-  const aura::Window* window = controller->GetFullscreenWindow();
+  const aura::Window* window = controller->GetTopmostFullscreenWindow();
   if (!window)
     return false;
   if (!window->GetProperty(kFullscreenUsesMinimalChromeKey))
     return false;
   return true;
 }
 
 // static
 ShelfLayoutManager* ShelfLayoutManager::ForLauncher(aura::Window* window) {
   ShelfWidget* shelf = RootWindowController::ForLauncher(window)->shelf();
@@ skipping 582 matching lines @@
       return gfx::Insets(0, distance, 0, 0);
     case SHELF_ALIGNMENT_TOP:
       return gfx::Insets(0, 0, distance, 0);
   }
   NOTREACHED();
   return gfx::Insets();
 }
 
 }  // namespace internal
 }  // namespace ash